Where did all the salt come from? What keeps the oceans from freezing? Why do icebergs float? What causes the tides and why are they beneficial? How deep are the oceans? As the fourth entry in the Wonders of Creation series, this book answers all of these questions and more, with full-color photos, charts, graphs, and illustrations that bring the murky, mysterious depths of the ocean to life. This superb book is a fantastic supplement to any homeschool curriculum, and contains many scripture references where God speaks about the oceans in His Word. It can be used as a reference book, and also makes a wonderful leisurely read. All ages from a middleschool level and up will enjoy this informative and fascinating book."